Tymshare was founded by Tom O'Rourke and Dave Schmidt in 1964 to sell time-sharing services. By the early 1970s, Tymshare had developed a number of specialized applications which were run by its customers on a remote basis. The company created its own very successful proprietary network, TYMNET, which was spun off into a subsidiary company. Tymshare was sold to McDonnell Douglas Corporation in 1984.